ASoC: omap: rx51: Add stereo output support to audio jack

Audio jack in Nokia RX-51/N900 is driven by TPA6130 headphone amplifier.
This patch adds support for it and stereo output can be active when
"Jack Function" == "TV-OUT" || "Headphone".

As the TPA6130 can output very high volume levels the output is limited
with snd_soc_limit_volume. Limiting value is found from Maemo kernel sources.

Signed-off-by: Jarkko Nikula <jhnikula@gmail.com>
Cc: Peter Ujfalusi <peter.ujfalusi@nokia.com>
Acked-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Signed-off-by: Liam Girdwood <lrg@slimlogic.co.uk>
diff --git a/sound/soc/omap/Kconfig b/sound/soc/omap/Kconfig
index a088db6..b592298 100644
--- a/sound/soc/omap/Kconfig
+++ b/sound/soc/omap/Kconfig
@@ -24,6 +24,7 @@
 	select OMAP_MCBSP
 	select SND_OMAP_SOC_MCBSP
 	select SND_SOC_TLV320AIC3X
+	select SND_SOC_TPA6130A2
 	help
 	  Say Y if you want to add support for SoC audio on Nokia RX-51
 	  hardware. This is also known as Nokia N900 product.